I was on the same ban wagon and I could provide you with the following useful information. First, here is the conversation I had with Alvin, Founder of VinShine Audio:
Q: "What is your no-confirmation-bias recommendation bet. Rivo Plus + Lhy25VA and Lumio U2 Mini w/ internal LPS upgrade? Thank you."
A: As much as I would love to sell my Lumin U2 Mini (one ex-demo, and one brand new, sealed unit), I would still honestly say that the RIVO+ is a better sounding unit.
The original RIVO is about the level of the U2 Mini. But the RIVO+ took it further, it’s above the Lumin. I told a few customers here in Singapore the same, and sold several RIVO+ lately for the same reason.
I guess if I continue to do that, I will be stuck with two unsold Lumin U2 mini for a while
Now, Lumin U2 is better than the Mini, with twice of the price but not twice better. Rivo+/LPS is a level better than the U2 Mini but less than 1/3 price of U2.
Second, take a look at the assessment from Hans and iiwi
1B -------- Innous Zenith Mk3 (Volumio Rivo+ / LPS per iiwi or)
1/4-------- Innuos Zen Mk3; (Volumio Rivo+ / LPS)
1/2-------- Volumio Rivo / LPS
3/4-------- Node ICON
2A ------- Volumio Rivo
So, Rivo+ / LPS could be on par with Zen or Zenith. Price wise, Rivo+ / LPS is selling at around $1650 New, Zen Mk3 Used (3-5 yrs) is selling around a similar or higher price, and Zenith Mk3 Used (again 3-5 yrs) is selling around $2.5k. Rivo+ / LPS has richer set of outputs incl. I2s and additional USB for ext. SSD/HDD, while Innuos has CD ripper and built-in SSD. What else do you want to know?